Centrifugal clarifier



M. LEITCH.

CENTRIFUGAL CLARIFIER. MPLICATION FtLED AUG.19, 1.919.

Pana M31.. 1,1921.

WWA/55s; I

30 collectible sediment; and combine,vwith that UNiiEp STATES PATENT] oF-'Fic-si.

'MEBEDITH LEI'rciLor roUGHxEErsIE, NEW Yoiix, AssIGNoR'To THE iin-LAVAL SEPARATOR COMPANY-v, OF NEW YORK, N. Y., CORPORATION F JERSEY.

GENTRIFU'GAL CLARIFIER.

To all whom t may co/[12cm f I Be a known 'that' i, Mamma L snH, a citizen o'f the United States"residin at 'Poughkeepsie,1c'o'unty vof Dutchess' and. tate of New York, havel invented a new and use` fu-l Improvement in Centrifugal Clarifiers,

.ofwhich the following is a full, clear, and

exact description, `reference being" had tothe avccompanyin drawings, which vorm a part of this speci tation:

My invention relates to centrifugal clari-Y fying bowls and has `for its object the provision of abowl which will hold a large quanthat sedimentv collected in centrifugal clarifiers fis seldom depositedfevenly around the periphery of the bowl'fand that when unevenly depositedthe bowl soonj becomesso -v badly'unbalance'd that it has to be stopped 20.

and cleaned long beforethe dirt holding space is filled. s In my. invention I provide for the heavier sediment, easily collected', a chamber. near the center of the bowl, where the influence of the sediment on the balance will be a` minimiimand pass the liquid to' be clarified j first through this chamber and then, when' freed of the coarser and heavier particles,

vthrough an annular clarifier of larger di-l aineter to remove the inerand less readily arrangement, vother features insuring, as nearly as possible, anmequal flow through all quarters of `the bowl and a substantially fperfect eliminationof the sediment and,y

avoiding any uneven deposition of sediment .that would'. cause unbalancing. v

In thedrawing, which illustrates a` pre-'V 1 ferred embodiment of 'my invention,I the Yiso figure lis a perspective view, partly broken withl outletsff. A tight joint Ibetween the bowl shell@ Vandl rubber :ring g, Vithin the bowl shell c and top e and concentric therewith is the wall h separating the twociiambers of the bowl. Above the. botthe .top e is made by a tom t of the'bowl' is a false. bottom i7 forining a bottom for the central chamber and:

having cut through it contracted passa-ges j i' Specification o f Letters Patent. l

.the size or number of the holes should from below the .central dis-charge -weir .In to the outer annular chamber. Z.

Patented Mar. 1, 1921. -Ap'puation nle-aggu'st'ie, ieianseriaino.31s,55e.

. Secured tof the inside ofthe wall h are.V l

several wings` m.' Secured to' the outside of i the wall AL. is va ring n approaching Aclosely k'to the inside of the bottom .of the bowl top e.

ovisa feed tube fondelivermg liquid to be clarified into the bowl'.- This tube is closedlat the bottom and provided with a l vertically vshort but'circumferentially extensive'opening p adapted yto deliver afIat.horizontalstream. i i j 'In operation, the bowl is revolved-at a tity of sediment. It' is aywell known fact high speedThe liquid to be clarified is sup-I plied to the tube 0 and, escaping horizontally through the outlet 72, enters the upper part of 'the central chamber. The wings Amfcause the liquid to revolve with the bowl. The

vliquid quickly fills the central chamber and thrown by centrifugal force` against the in-- side of the wall 7i and there deposited. Only the partially clarified liquid escapesover the weir 7c and, flowing outward through the passages y', soon fills the annular outer chamber Z. throughtlie space Z, it subjected to a much greater centrifugal force, which throws out lsediment .too fine and 'light to be thrown out inthe centralchamber. rllhe ring n insures that before escaping from lthe bowl all liquid is finally subjected to the maximum centrifugal force.V

The size of the restricted passages j is a variable factor thatv depends u 'on the cef pac'ity of the bowl rather than its size;th e capacity, in a bowl of given size, varying with the particular liquid treated, someliquids. being much more readily clarifiable than others. Thus, iii a bowl having a capacity of 200 gallons an hour, eight holes of one-quarter inch diameter are suflicient. If operating on a liquid that is veryhard to As the liquid passes upward4 clarify, the capacity will be much less and f reduced. rlhc given dimensions 'ofpa 7 with a bowl of assumed capacity are i illustrative, tl e necessary governing bei l I throttling effect, .they-will cause equal delivery of'liquld to all quartersof the annular chamber z.

` Haring nowfully described my invention,

what I claim and. desire to protect by Let/l- Vters Patent'is:

Y 1..' In a centrifugal clarifier," inl'combihaif.:

tion, avplurality lof consecutive'chambers .of

progressively increasing 1' centrifugal force,

e "chamber to another.' 2.' Inav .centrifugal clarifier, 'in combina-n tion, a feedtube withiclosed bottom and side outlet, a-rotatabl'e clarifier bowl having a there 'being contracted passages'v `from one .central clarifying Acha'mberjand an annular clarifying l chamber, .there being contractedpassa-ges betweenthe chambers, and means bination, a ,centralcl'arifying chamber oflowv centrifugal "force, a" circular weir con I I the maximum radius 4Lapin to cause allliquid'to approach closelyvto of the bowl before es- 3. n a ce trifugaLclarifierfbowl, in comv trolling' the outflow .from v'said chamber,

there being contracted'passages 'from -t el l aA weirlocated relatively near 'theaXis'o r0- -jtati'o'n' ofthe bowl and over which 'the liquid inz'the-inner ychamber nearest the axis off the bowl is discharged inwardly, there being Vpassage beneath the inner chamber throu vh which the liquidl sodischarged passes to tflle outer chamber. v

` 5.' .An-centrifugal clarifier, comprising a plurality of consecutive\ clarifying cham. bers of progressively increasirjfcentrifugal force, the inner chamber having a. bottom sloped upward and'inward toa, free edge.

which forms a Weir, overwhichl liquids must `low in passing the .inner vchamber vtoward the outer'cli'ambers. j

., '6. In acentriugal clarifier, 'in combin'a- I tion,'ia preliminary clarifying chamber of vlcw v( :ent'frifl'igal force, a concentric circular discharge Weir-of relatively small.- diameter,

ajinal'clarifying chamber of`high centrif- 'ugal orcefed by the'overlow of said'weir,

and means to' cause alll the liquid to appreach' closely tothe maximum radius of the bowl'l before discharging'lfrom the final chamber.

v 73. In a centrifugal clarifier bowl, the coni- `bination, with the bowl, of a partition dividing the-*bowl into 'an inner chamber of low `'centrifugal :force and an outerj chamber of high centrifugal force, thebottom ofthe inner chamber nearer the 4axis being at 'a higher elevation than that'part of the lbottom nearest the partition and having a free inner edge forming a weir over which the liquid flows in its passage to theouter cham` ber. 1 I

8. In a centrifugal clarifier' bowl, the com'- bination with a bowl rotatable on a vertical axis and means dividing the bowlinto 'two concentric clarifying chambers', the center, measuring in a vertical direction, of the -outer chamber being substantially below the:

center, measured 1n the same direction, of

the inner chamber, there being communicating'means between the' two passages so restricted as, by their throttling effect,- to cause equal delivery of the liquid throughout the outer chamber. 'l Intestimonyv of which' invention, I have hereunto set my hand, at Poughkeepsie, N. Y., on this l5 'day of August, 1919.

i MEREDITH Lernort. 

